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Mensagem original de: Annette Flottwell ,


I would suggest the same as Dan says. Hold the Shift-Control-Option on the left side of the keyboard

'''for at least 10 seconds''' otherwise it doesn't work.

If this doesn't help, check the symptoms for  the MagSafe DC-In Board.

Maybe that is your problem.

Very important, you don't say which system you are running. When I installed Yosemite or El Capitan, it was going onto Icloud all the the time, wasting bandwidth and energy. My internet access is metered here in Costa Rica so I dumped the 'improved' systems and reinstalled 10.8.5.

Result: more battery, less waste of internet and better performance altogether.